Piston with adjustable ring



A. J. MILLER PISTON WITH ADJUSTABLE RING Filed April 18. 1922 dil Patented Oct. 20, 1925.

UNITED STATES ANDREW J. MILLER,

0F MASSILLON, OHIO.

PISTON WITH ADJUSTABLE RING.

.Application illcd April 18, 1922. Serial No. 555,085.

T0 all whom it may concern.'

Be known that I, ANDREW J. Minnen, a citizen of the United States, residing at Massillon, in the county of Stark and State of Ohio, have invented a new and useful Piston with Adjustable Ring, of which the following is a specification.

This invention relates to pistons for internal combustion engines and more particularly to a piston provided with means for adjusting the ring.

The objects of the invention are to provide a piston having adjusting means by means of which the ring may be quickly and easily expanded and held in the adjusted position in order that wear upon the ring or the cylinder may be compensated, the life of the ring being lengthened and a proper compression being assured.

The above and other objects may be attained by providing longitudinal bores through the piston and in communication with the ring grooves, eccentric screws being located within the bores and arranged to be extended into the ring grooves to expand the rings in order to always hold them in tight engagement with the walls of the cylinder; a substantially annular tension spring being preferably located around the inner face of each ring and in engagement withthe eccentric screws, means being provided for holding the eccentric screws in any desired adjustment.

A preferred embodiment of the invention thus set forth in general terms is disclosed in the accompanying drawings, in which--- Figure 1 is a longitudinal sectional view through a piston embodying the invention, showing the adjusting screws in the fully extended position;

Fig. 2, a similar fragmentary view showing an adjusting screw in the retracted posi tion;

Fig. 3, a section on the line 3 3, Fig. 1;

Fig. 4, a top plan View of the piston showing the spider which holds the adjusting screws in position;

Fig. 5, a detail perspective view of one of the adjusting screws; and

Fig. 6, a detail perspective view of the spring.

Similar numerals indicate corresponding parts throughout the drawing.

The improved piston which constitutes the subject matter of the invention comprises the head 1 and skirt 2 provided with the annular ring grooves 3 near the upper end thereof. Longitudinal bores Il are provided at intervals extending through the head and communicating with the ring grooves 3, the skirt of the piston being reinforced around each of said bores as by the boss 5.

' The upper end portion of each bore L1, above the upper ring groove is threaded as shown at 6 and receives the threaded portion 7 of the eccentric adjusting screw 8 which is extended through the bore 4 and provided/at its lower end with the pintle 9 concentric with the threaded portion 7 thereof which extends into a suitable bearing socket 10 formed in the piston at the lower end of the bore 4.

The rings 1l are of the usual split ring type and a polygonal spring 12 of t-he shape best shown in Figs. 3 and 6 is interposed between each ring and the annular face of the ring groove, engaging the eccentric screws 8.

Each of the eccentric screws is provided with a square head 13 extending above the head of the piston and arranged to be received in a square opening 14 formed in the spider 15 which is fixed upon the head .of the piston as by the screw 16 which is inserted into the internally threaded boss 17 formed upon the inner face of the piston head.

In assembling the rings upon the piston, the adjusting screws 8 are inserted and turned to the retracted position as shown rn Fig. 2, the spider 15 being then placed in position and attached to the piston head by the screw 16, holding the adjusting screws in this position.

The spring 12 is then placed in the ring groove and the ring 11 placed in the groove around said spring, the parts assuming the position shown in Fig. 2.

yWhen the wear upon the rings necessitates adjustment of the same, the spider 15 is removed and each of the adjusting screws is given a quarter turn, slightly expanding the rings 11 after which the spider is replaced, holding the screws in this position. When further wear necessitates the full extension of the rings, the operation is again repeated, the adjusting screws being moved to the fully extended position shown in Fig. 1 and held in this position by the spider 15.

1t will be evident from the above and the accompanying drawing, that an easy and ecient adjustment is provided whereby the ordinary piston ring may be quickly adjusted to compensate for Wear and to assure a proper compression and the ring when adjusted tothe desired position. Yis positivehv held expanded to the proper extent.

I claim l. A piston of the character described provided with Yring grooves, split rings located in said grooves, a polygonalspring within each groove engaging ithe inner face oi the ring, eet-entries extending longitudinally through the ring grooves and engaging the inner surface of the polygonal springs for expanding the split rings. a squared head Yupon each eccentric extended through the top of the piston and a spider detachablv mounted upon the top of the piston and having squared holes for engagement with the squared heads upon the eccentrics to hold'the eccentrics in adjusted position.

2. A piston of the character described proyided With ring grooves, split rings located in said grooves and eccentric screws extending longitudinally through the ring grooves for expanding the rings. aiY squared 'head Yupon each screw and a spider upon the pist0n having squared holes for engagement with said heads. l

3. A piston of the character described provided with ring grooves, split rings located in said grooves, a polygonal spring Within each Ygroove engaging the inner face of tlie ring, and eceentrics extending longitudinallv through the ring grooves for expanding the rings and a spider for holding the eccentries in adjusted position.

ANDREW J. MILLER. 

